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  • Formerly administered as part of the British Crown Colony of Mauritius, the British Indian Ocean Territory (BIOT) was established as an overseas territory of the UK in 1965. A number of the islands of the territory were later transferred to the Seychelles when it attained independence in 1976. Subsequently, BIOT has consisted only of the six main island groups comprising the Chagos Archipelago. Only Diego Garcia, the largest and most southerly of the islands, is inhabited. It contains a joint UK-US naval support facility and hosts one of four dedicated ground antennas (the others are on Ascension (Saint Helena, Ascension, and Tristan da Cunha), Kwajalein (Marshall Islands), and at Cape Canaveral, Florida (US)) that assist in the operation of the Global Positioning System (GPS) navigation system. The US Air Force also operates a telescope array on Diego Garcia as part of the Ground-Based Electro-Optical Deep Space Surveillance System (GEODSS) for tracking orbital debris, which can be a hazard to spacecraft and astronauts.
    Between 1967 and 1973, former agricultural workers, earlier residents in the islands, were relocated primarily to Mauritius, but also to the Seychelles. Negotiations between 1971 and 1982 resulted in the establishment of a trust fund by the British Government as compensation for the displaced islanders, known as Chagossians. Beginning in 1998, the islanders pursued a series of lawsuits against the British Government seeking further compensation and the right to return to the territory. In 2006 and 2007, British court rulings invalidated the immigration policies contained in the 2004 BIOT Constitution Order that had excluded the islanders from the archipelago, but upheld the special military status of Diego Garcia. In 2008, the House of Lords, as the final court of appeal in the UK, ruled in favor of the British Government by overturning the lower court rulings and finding no right of return for the Chagossians. In March 2015, the Permanent Court of Arbitration unanimously held that the marine protected area (MPA) that the UK declared around the Chagos Archipelago in April 2010 was in violation of the UN Convention on the Law of the Sea.

  • archipelago in the Indian Ocean, south of India, about halfway between Africa and Indonesia
    6 00 S, 71 30 E; note - Diego Garcia 7 20 S, 72 25 E
    Political Map of the World
    total: 60 sq km
    land: 60 sq km; Diego Garcia 44 sq km
    water: 54,340 sq km
    note: includes the entire Chagos Archipelago of 55 islands
    country comparison to the world: 230
    land area is about one-third the size of Washington, DC
    0 km
    698 km
    territorial sea: 12 nm
    Environment (Protection and Preservation) Zone: 200 nm
    tropical marine; hot, humid, moderated by trade winds
    flat and low (most areas do not exceed two m in elevation)
    mean elevation: NA
    elevation extremes: lowest point: Indian Ocean 0 m
    highest point: ocean-side dunes on Diego Garcia 9 m
    coconuts, fish, sugarcane
    agricultural land: 0%
    arable land 0%; permanent crops 0%; permanent pasture 0%
    forest: 0%
    other: 100% (2011 est.)
    none; located outside routes of Indian Ocean cyclones
    wastewater discharge into the lagoon on Diego Garcia
    note 1: archipelago of 55 islands; Diego Garcia, the largest and southernmost island, occupies a strategic location in the central Indian Ocean; the island is the site of a joint US-UK military facility
    note 2: Diego Garcia is the only inhabited island of the BIOT and one of only two British territories where traffic drives on the right, the other being Gibraltar

  • no indigenous inhabitants
    note: approximately 1,200 former agricultural workers resident in the Chagos Archipelago, often referred to as Chagossians or Ilois, were relocated to Mauritius and the Seychelles in the 1960s and 1970s; approximately 3,000 UK and US military personnel and civilian contractors living on the island of Diego Garcia (2018)

  • conventional long form: British Indian Ocean Territory
    conventional short form: none
    abbreviation: BIOT
    etymology: self-descriptive name specifying the territory's affiliation and location
    overseas territory of the UK; administered by a commissioner, resident in the Foreign and Commonwealth Office in London
    the laws of the UK, where applicable, apply
    chief of state: Queen ELIZABETH II (since 6 February 1952)
    head of government: Commissioner Dr. Peter HAYES (since 17 October 2012); Administrator John MCMANUS (since April 2011); note - both reside in the UK and are represented by the officer commanding British Forces on Diego Garcia
    cabinet: NA
    elections/appointments: the monarchy is hereditary; commissioner and administrator appointed by the monarch
    none (overseas territory of the UK)
    none (overseas territory of the UK)
    white with six blue wavy horizontal stripes; the flag of the UK is in the upper hoist-side quadrant; the striped section bears a palm tree and yellow crown (the symbols of the territory) centered on the outer half of the flag; the wavy stripes represent the Indian Ocean; although not officially described, the six blue stripes may stand for the six main atolls of the archipelago

  • All economic activity is concentrated on the largest island of Diego Garcia, where a joint UK-US military facility is located. Construction projects and various services needed to support the military installation are performed by military and contract employees from the UK, Mauritius, the Philippines, and the US. Some of the natural resources found in this territory include coconuts, fish, and sugarcane.
    the US dollar is used

  • general assessment: separate facilities for military and public needs are available
    domestic: all commercial telephone services are available, including connection to the Internet
    international: country code (Diego Garcia) - 246; international telephone service is carried by satellite (2015)
    Armed Forces Radio and Television Service (AFRTS) broadcasts over 3 separate frequencies for US and UK military personnel stationed on the islands (2009)

  • 1 (2013)
    country comparison to the world: 213
    total: 1
    over 3,047 m: 1 (2017)
    note: short section of paved road between port and airfield on Diego Garcia
    major seaport(s): Diego Garcia
  • Military and Security :: BRITISH INDIAN OCEAN TERRITORY

  • no regular military forces (2014)
    defense is the responsibility of the UK; in November 2016, the UK extended the US lease on Diego Garcia for 20 years; the lease now expires in December 2036
  • Transnational Issues :: BRITISH INDIAN OCEAN TERRITORY

  • Mauritius and Seychelles claim the Chagos Islands; negotiations between 1971 and 1982 resulted in the establishment of a trust fund by the British Government as compensation for the displaced islanders, known as Chagossians, who were evicted between 1967-73; in 2001, the former inhabitants of the archipelago were granted UK citizenship and the right of return; in 2006 and 2007, British court rulings invalidated the immigration policies contained in the 2004 BIOT Constitution Order that had excluded the islanders from the archipelago; in 2008 a House of Lords' decision overturned lower court rulings, once again denying the right of return to Chagossians; in addition, the UK created the world's largest marine protection area around the Chagos islands prohibiting the extraction of any natural resources therein